The traceable calibration of the pressure transmitter and flow meter ensures a very high level of reproducibility. The easy check functions of the instrument, guarantee fast and reliable routine measurements with the highest possible precision.

Easy to use

Once the measuring sequence has been set the operator simply places the paper sample in the measuring gap. Then a sensor detects the paper and the measuring process starts. L&W Air Permeance Tester, low range, quickly and automatically clamps the sample in position with a clamping pressure of 1 MPa and readings are taken in accordance with the preset measuring time. Then the sample is released and a new sample can be measured. Automation prevents any errors, or poor reproducibility caused by differences in instrument handling.

The results are shown in µm/Pa s on a display and printed out on the built-in printer. Results can also be sent to a laboratory computer via the signal output.

Environmentally friendly

L&W Air Permeance Tester, low range, is based on modern components for measurement of air pressure and airflow. The problems associated with mercury and oil have been eliminated. The automatic clamping, and preset measuring time which is usually 30 seconds for all kinds of samples, guarantees correct measurements. This results in considerable time savings, when measuring paper grades with low levels of air permeance.